MAL-2026-9837 Malicious code in zwan_cal_jan1 (RubyGems)
Malicious package
Published
MAL-2026-9837 is a malicious package: zwan_cal_jan1 (RubyGems). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-9837/ (Markdown: https://insights.sbomify.com/MAL-2026-9837/index.md)
- Package
- zwan_cal_jan1
- Registry
- RubyGems
What is MAL-2026-9837?
MAL-2026-9837 is a malicious package in zwan_cal_jan1, published on 7 Jul 2026.
Official description
What should I do about MAL-2026-9837?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.
Sources
Also known as GHSA-x6jw-jh72-4mqj.